Import issues

[ahmed-akader]

RAM_Net/train.py attempts to import some nonexistent trainer.trainer_no_recurrent -- in the main branch only. I figured I could just remove that line.

RAM_Net/model/metric.py has this import line from skimage.measure import compare_ssim as ssim which I had to change to from skimage.metrics import structural_similarity as ssim. I read that compare_ssim was going to be deprecated, but I haven't checked further; see the StackOverflow post here.